In the rich text editor:
@urtekuller
In a comment:
[urtekuller](https://chowlings.com/user/urtekuller)
For Names and Avatars:
In the rich text editor:
%urtekuller
In a comment:
[![urtekuller's Avatar](https://chowlings.com/images/avatars/198.png?v=1644063265)](https://chowlings.com/user/urtekuller) [urtekuller](https://chowlings.com/user/urtekuller)